Device for controlling fluids.



A. G. NELSON. DEVICE FOB CONTROLLING FLUIDSu APPLICATION rum) Alum. 1909959,025 Patented Ma 24, 1 gm.

ANDREW 8. GRANAM co. WOIO UYNDGRIPMERS.WASNINGYON. n c

UNITED STATES PATENT OFFICE.

ALFRED C. NELSON, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-THIRD TO ARTHUR G.MCKEE AND ONE-THIRD TO DAVID T. CROXTON, OF CLEVELAND, OHIO.

DEVICE FOR CONTROLLING FLUIDS.

Specification of Letters Patent.

Application filed April 2, 1909.

Patented May 24, 1910.

Serial No. 487,559.

To all whom it may concern:

Be it known that I, ALFRED C. NELSON, a citizen of the United States,resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented a new and useful Improvement in Devices for Controlling Fluids,of which the following is a specification, the principle of theinvention being herein explained and the best mode in which I havecoi'itemplated applying that principle, so as to distinguish it fromother inventions.

My invention relates to devices for controlling fluids.

The object of my invention is to eliminate the transmission of pressurefrom one part of a valve-controlled fluid duct to another part thereofas a result of leakage through the valve.

A particular object of the invention is to eliminate the danger toworkmen While making repairs, arising from the leakage in the gas --mainof a blast furnace stove while such repairs are being made. Theprinciple ofthe invention may, however, be applied to high-pressurewater mains, as I shall hereinafter explain.

The said invention consists of means hereinafter fully described andparticularly set fort-h in the claims.

The annexed drawing and the following description set forth in detailcertain means embodying my invention, the disclosed means constitutingbut one of the various mechanical forms in which the principle of theinvention may be used.

In said annexed drawing :Figure 1 is a vertical axial section of adevice embodying my invention, as applied to the gasmain of a blastfurnace stove, and illustrating a portion of such gas main including twoopposing main-sections forming an intermediate valve-space, togetherwith a section of the valve casing, and a broken elevation of theattached parts. Fig. 2 is an elevation of the mechanism shown in Fig. 1,viewed from the plane indicated by line II-II in Fig. 1.

The two sections A A of the gas main are provided with two opposingvalve seats a a, which form between them the valve-space 64. Above thisspace is a valve-casing B into which the double gate-valve B may beraised when it is desired to permit the gas to flow from one sectioninto the other. This gate-valve is of any well known construction,whereby the valve-openings surrounded by the valve-seats a a may besimultaneously closed or opened.

The valve-stem B projects upwardly through the casing B and is suitablypacked in the usual manner to prevent leakage of the gas through saidcasing and around said stem. That portion of the stem projectingupwardly from the casing is threaded as shown. A bevel-gear B engagesthe said threaded portion as a nut. A second bevelgear B mounted upon asuitable spindle engages the gear B An operatingwheel B is secured tothe said spindle and by means of its rotation the valve may be raised orlowered, as will be readily understood.

The valve-space a is provided with an opening a to which is connected aduct A. This duct extends upwardly and terminates in a valve-seat a Fig.2. Fulcrumed in a suitable standard a is a lever A One arm of this leveris provided with a counterweight a and adjacent to this weight is hung avalve A which is adapted to engage the valve-seat a and open or closethe end of the duct A. The other arm of the lever A has secured to itone end of the chain A, whose other end is secured to the extremity ofthe valve-stem B, as shown in Fig. 2. The length of this chain is madesuch that valve A would be raised off of the seat a when the valve islowered and the duct A will therefore be open to atmosphericcommunication.

l/Vhen the gate-valve B is in its raised position wherein the gas maypass from one main-section to the other, valve A is in its closedposition and atmospheric communication with duct A is cut off. \Vhen itis desired to repair any part of the blast furnace which is incommunication with the gasn1ain, the gate-valve B is lowered and theends of the main-sections closed so as to intercept the flow of gasthrough such main. It has been found however, in the past that whenthese gate valves are in this closed position, gas oftentimes leaksbetween the valve-disks and thus gains access to that part of the blastfurnace in which the workmen are making the repairs. This has oftenendangered the lives and health of such workmen. By providing theopening a and the duct A which communicates with the valve-seats, andarranging the parts so that the valve A is open and the valve B isclosed, all such leaking gas is permitted to escape into the atmospherethrough said duct A, and is thereby prevented from reaching the part ofthe furnace which is being repaired.

Secured to the main and communicating with the bottom of the valve spacea, is a receptacle O whose shell is provided with an opening in its sidecontrolled by a manually operable slide 0. By means of this receptacleall dirt, cinders or other substances carried by the gas, which tend toaccumulate in the space a and interfere with the proper operation of thevalve, is deposited so as to completely eliminate such interfer ence,and may be removed through the slidecontrolled openin When the device isapplied in connection with a high-pressure water-main, a screw orother'suitable valve (not shown) is substituted at a suitable place induct A by means of which atmospheric communication may be positivelyshut off, as will be readily understood. In this case, the action is thesame as described in connection with the gas main, eXce oting that theduct valve is manually instea of automatically actuated.

Having fully described my invention, what I claim therefore and desireto secure by Letters Patent is 1. In a device of the class described,the combination of a fluid main intersected by a valve-space; a valveoperating in said space, and adapted to control the flow through saidmain; the latter being provided with an outlet communicating with thesaid valve-space, independently of the fluid duct in said main; aninclosed receptacle below said valve-space and communicating therewith,such receptacle being provided with an opening; and means for openingand closing such opening.

2. In a device of the class described, the combination of a fluid mainintersected by a valve-space; a valve operating in said space adapted tobe moved upwardly so as to permit of the flow of fluid through the main,the downward movement of such valve intercepting such flow; a ductcommunicating with said valve-space and the atmosphere independently ofthe main; an inclosed receptacle beneath the valve-space provided withan opening; and means for controlling said opening.

3. In a device of the class described, the combination of a fluid-mainintersected by a valve-space; a valve operating in said space andadapted to intercept the flow of fluid through said main; a ductcommunicating with said valve-space; and a valve for controlling theflow of fluid through said duct; said main-valve and duct-valve beingoperatively connected with each other, whereby the position of theformer will determine the position of the latter.

4. In a device of the class described, the combination of a fluid-mainintersected by a valve-space; a valve operating in said space andadapted to intercept the flow of fluid through said main; a ductcommunieating with said valvespace; and a valve for controlling the flowof fluid through the latter; said main-valve and ductvalve beingoperatively connected whereby the duct-valve is caused to assume an openposition when the main-valve is in its closing position.

5. In a device of the class described, the combination with twomain-sections provided with opposing valve-seats and forming avalve-space between such seats; a double gate-valve movable in saidspace and adapted to engage said seats to close the opposingmain-sections; a stem connected with said gate-valve; a ductcommunicating with said valve-space; a lever mounted upon said duct; avalve on one arm of said lever adapted to open and close said duct; achain having one end connected with the other arm of said lever and theother end connected with said valve-stem.

6. In a device of the class described, the combination of a fluid mainintersected by a valve-space; a valve adapted to move in a directiontransverse with respect to the axis of the main, and also arranged tohave a movement in the direction of such axis to close the valve-seat insaid main; an outlet afi'ording communication between such valve-spaceand the atmosphere independently of said main; an inclosed receptaclebelow said valve-space communicating therewith, for receiving the solidmatter carried by the fluid in the duct, said receptacle being providedwith an opening in its wall; and a door for controlling said receptacleopening.

Signed by me, this 31st day of March. 1909.

ALFRED G. NELSON.

Attested by- WVINIFRED \VALTZ, IVM. R. MILLER.

